**7. Legislation of digestate utilization in agriculture**

Sustainable recycling of organic wastes demands clear regulations of recycled wastes, the used recycling methods and the controlling of products. These regulation processes for the digestate are different in certain countries, respected the elaboration and the used limits.

In Hungary, the digestate is regarded as other non-hazardous waste if the ingestate does not contain sewage or sewage sludge, while in the presence of these materials the conditions of the digestate utilisation depend on the quality of the given material.

In Scotland the BSI PAS110:2010 digestate quality assurance scheme is applied. If a digestate complies with the standards for the quality, the usage criteria and the certification system stated in the worked scheme, the Scottish Environment Protection Agency (SEPA) does not apply the waste regulatory control for it.

In Swiss the digestate which suits the limits, can be used as soil conditioner and fertilizer in "bio"-agriculture.

In Germany the origin of the input materials determines the quality label of digestate product by biowaste and renewable energy crops. Digestates have to fulfil the minimum quality criteria for liquid and solid types which determine the minimum of nutrients and the

Digestate: A New Nutrient Source – Review 307

Microbiological activity of soil could be increased by application of digestate which is also

Beyond these "classical" application possibilities of digestate, there are new promising alternatives for its utilization which means more opportunities to use this valuable matter

Our thanks to Dr. Judit Dobránszki at the University of Debrecen, Research Institute of Nyíregyháza and Prof. György Füleky at the Szent István University, Department of Soil Sciences and Agrochemistry for their enthusiastic checking of the English and for their

Balsari, P., Menardo, S., Gioelli, F. & Dinuccio, E. (2009). Il progetto europeo EU Agrobiogas:

Banik, S. & Nandi, R. (2004). Effect of supplementation of rice straw with biogas residual

Bendixen, H.J. (1999) Hygienic safety: results of scientific investigations in Denmark (sanitation

Binder, D.L., Sander, D.H., Frank, K.D. & Shires, W.L. (1996). Nitrogen fertilizer equivalency

Börjesson, P. & Berglund, M. (2007). Environmental systems analysis of biogas systems―Part

Fuchs, J.G. & Schleiss, K. (2008). Effects of compost and digestate on environment and plant

Furukawa, Y. & Hasegawa, H. (2008). Response of spinach and komatsuna to biogas effluent

Georgacakis, D., Sievers, D.M. & Ianotti, E.L. (1982). Buffer stability in manure digesters. *Agricultural Wastes*, Vol. 4, No. 6 , (November 1982), pp. 427-441, ISSN 09608524

35, No. 5, (September-October 2006), pp. 1939-1947, ISSN 0047-2425 Gao, T. & Li, X. (2011). Using thermophilic anaerobic digestate effluent to replace freshwater

Experiences in Europe. Universität Hohenheim, Stuttgart, pp. 27-47.

*Bioenergy,* Vol. 31, No. 5, (May 2007), pp. 326-344, ISSN 0961-9534

nell'ingegneria dei biosistemi agro-territoriali, Ischia (NA)

finalitá, obviettivi e primi risultati ottenuti. In: Proceedings of IX Convegno Nazionale dell'Associazione Italiana di Ingegneria Agraria – Ricerca e innovazione

slurry manure on the yield, protein and mineral contents of oyster mushroom. *Industrial Crops and Products*, Vol. 20, No. 3, (November 2004), pp. 311-319, ISSN

requirements in Danisc Biogas Plants). In: Proceedings of the IEA Workshop: Hygienic and Environmental Aspects of Anaerobic Digestion: Legislation and

of anaerobical digested municipal sludge. In: Proc. North Centr. Axt.-Ind. Soil Fert. Conf. 26th, St. Louis, MO. 20-21 Nov.1996. Vol. 12. pp. 108-114. Potash and

II: The environmental impact of replacing various reference systems. *Biomass and* 

production – Results of two research project. Proceedings of the Internationale Conference ORBIT 2008, Wageningen, 13-16 October, 2008. CD-ROM (*ISBN 3-*

made from source-separated kitchen gabage. *Journal of Environmental Quaity,* Vol.

for bioethanol production. *Bioresource Technology,* Vol. 102, No. 2, (January 2011),

an important condition of soil fertility.

**10. Acknowledgment** 

**11. References** 

0926-6690

*935974-19-1*)

for making better our environment and our life.

valuable comments on improvements of the manuscript.

phosphate Inst., Brookings, SD.

pp. 2126-2129, ISSN 0961-9534

maximum of pollutions in the digestate. Pollutions mean toxic elements, physical contaminants and pathogen organisms. The quality of digestate products is regularly controlled by "Bundesgütegemeinschaft Kompost e.V." (BGK) (Siebert et al., 2008).
